Yes.
When I was in high school,
I couldn't go to the school Canteen and would pay my friends money to buy my food for me. Other then food bought at the canteen (maybe 5 times a year, I could never eat in school. I still have some difficulties eating in front of people who aren't my close family).
I couldn't go out anywhere, especially the cinemas (some bad experiences when I was younger, like friends being loud, or people throwing things at me).
My sister is VERY loud and my dad always says awful jokes..which I felt humiliated me and I didn't want to be seen with them. I would shush my friends or family in public if I thought they were drawing unnecessary attention to me. I still do to a large degree. Like if my mum got mad at someone at McDonald's for getting our order wrong and she would yell, I would hide somewhere nearby and cry. If my teacher yelled at someone in class, I would wait till class was over then go cry somewhere hidden.
It got to a point where I couldn't post on my forums on the Internet, and barely talked to anyone on MSN. I tried to never speak because I felt everything I said was awful and would make me sound stupid.
The turning point for me was getting into University, followed by getting my first job. Both forced me to engage with people to some degree, whether it was taking public transport, to class discussions which were part of my assessment, or my job which was to say hello to people entering the store.
Now days I can go to the cinemas whenever I want, I can go shopping and talk to cash registers. I'm happy and cheery at my job and have regular customers I swap stories with. I engage frequently in University classes, and have made some tentative friendships. I'm even planning to join dance lessons in the summer. I can sometimes call people like when I joined my private health insurance or my Internet died and my mum wouldn't call for me.
I feel like I'm getting over it, like its possible now. Its not perfect, I still have trouble making friends, I could never imagine going out to a restaurant or a nightclub. I still feel uncomfortable in some of the situations I talked about above, but I CAN do them now. But my number one break through was the stopping of the stomach pains I use to suffer everyday, where I would pretty much be unable to walk and be throwing up constantly. Now no pain. One thing that really helped me was finding out that what was wrong with me wasn't in my head, it had a name and symptoms, and treatment and OTHER people believed it existed. It was like a soothing balm. And of course some of my other problems come from depression and what I think may be other similar disorders or problems, but I have no diagnosis of any of this, except my own studies in Psychology.
While I'm going, a lot of people mention fear of public speaking, which is one thing I have never had a problem with. I had to give a speech in front of 260 people at my state library, with famous authors and all present, and not a problem. My mind turns off and just talks..even in class orals I have never suffered a fear of that. Which surprises and confuses me.